When you get high with a bunch of people who don't speak your language.
Rick: Dude, all those guys from China were hella chill.
Dale: Yeah man, you got so Rosetta Stoned.
by ThoseGuysFromChina February 10, 2012
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When someone not ordinarily prone to party, live it up, or be out of control does just that.
Man, Michael Phelps got cold busted getting Rosetta Stoned.
by Otto the Orange February 3, 2009
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The state of being so high that you begin speaking another language.
Friend 1: Yo, did you know that Marcel speaks Mandarin?
Friend 2: Yeah, but he only knows it when he's high as a kite, man. He was straight up Rosetta stoned last night.
by YungSebs April 21, 2016
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When someone is so stoned that they start speaking another language.
Guy 1: Hey man, what's up?
Guy 2: Je suis un buffle!
Guy 1: What are you, Rosetta Stoned?
Guy 2: Si senor.
by EightBitDictionary April 25, 2016
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